- 권한신청
- P-ISSN1226-9654
- E-ISSN2733-466X
- KCI
노화와 경도 인지기능장애가 작업기억과 재인기억에 미치는 효과: 운전능력에 대한 함의
Effects of Aging and Mild Cognitive Impairment on Working and Recognition Memory: Implication on Driving
신현정 (부산대학교)
이재식 (부산대학교)
초록
본 연구는 경도 인지기능 장애 노인(MCI) 집단의 기억 결함을 평가하기 위해 언어적/공간적 작업기억 과제와 운전상황을 모사한 동적상황 재인과제를 실시하였다. MCI 집단의 수행은 신호탐지론에 기초한 반응민감도와 반응기준의 관점에서 대학생 집단 및 동일-연령대 정상 노인 집단의 수행과 비교되었다. 본 연구의 결과를 요약하면 다음과 같다. 먼저, 공간 작업기억 과제와 언어 작업기억 과제에 대한 MCI 집단의 수행은 다른 두 집단에 비해 상대적으로 더 저조하였다. 둘째, 동적상황에 대한 재인에서 MCI 집단은 다른 두 집단에 비해 자극 장면의 시간적 위치와 상관없이 일정하게 낮은 민감도를 보인 반면, 정상 노인 집단은 비교적 최신의 장면(예를 들어, 5초 이전에 제시된 장면)에 대해서는 그 이전의 자극에 비해 재인 민감도가 상승하는 경향을 보였다. 셋째, MCI 집단의 ‘yes’ 반응경향성(반응기준)은 재인자극의 각 시간적 위치에 따라 불안정적으로 변화되는 경향을 보인 반면, 대학생 집단과 정상노인 집단은 중립적이거나 ‘관대한’ 반응을 비교적 안정적으로 보였다. 본 연구의 결과들은 MCI 집단이 갖는 기억에서의 결함이 기초적인 작업기억 과제 수행뿐만 아니라, 운전상황과 같은 시간적 진행 과정이 포함된 사상에 대한 재인기억 과제 수행에도 영향을 줄 수 있다는 것을 시사한다. 이러한 결과가 주는 시사점과 본 연구의 제한점을 논의하였다.
- keywords
- working memory, driving situational recognition memory, driving performance, aging, Mild Cognitive Impairment, 작업기억, 동적상황 재인기억, 운전수행, 노화, 경도 인지기능 장애
Abstract
To investigate the nature of memory deficit of Mild Cognitive Impairment patient group(MCI group), the present study measured MCI group's verbal and spatial working memory capacity and recognition ability for dynamic driving scenes(which were varied in their temporal position) in terms of sensitivity(d') and response criterion(c), and compared them with those of college students and normal old-aged group. The results can be summarized as followings: First, MCI patient showed more degraded performances in both types of memory tasks than the other two groups. Second, although MCI group showed stable and lowered sensitivity for driving-scene stimulus along the different temporal position, normal old groups showed increased sensitivity for the relatively recent stimulus(i.e., observed 5 seconds before). Third, MCI group tended to respond based on unstable response criterion which resulted in a large fluctuation from conservative to lenient responses, whereas college students and normal old groups appeared to adopt relatively stable and neutral(or lenient in case of normal old group) response criterion. The implications and limitations of this study were discussed.
- keywords
- working memory, driving situational recognition memory, driving performance, aging, Mild Cognitive Impairment, 작업기억, 동적상황 재인기억, 운전수행, 노화, 경도 인지기능 장애
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